Code 27011: Axis %1 safe velocity exceeded
Issue Description & Safety Warning
The Siemens SINUMERIK 840D CNC has triggered a critical Axis %1 safe velocity exceeded alarm. Immediate attention from a qualified operator or maintenance technician is required to prevent secondary damage to the equipment or spoiled parts during the manufacturing cycle. Always ensure standard safety and LOTO procedures are followed before accessing electrical cabinets.
Official Troubleshooting Steps
Parameters: %1 = Axis number Definitions: The axis has moved too quickly and faster than a llowed in MD $MA_SAFE_VELO_LIMIT. With active SBH/SG and a 1-encoder system, the velocity whic h corresponds to an encoder limit frequency of MD SAFE_ENC_FREQ_LIMIT has been exceeded. Reaction: NC Start disable in this channel. Interface signals are set. Alarm display. NC Stop on alarm. Axis stop with STOP A, C, D or E, depending on the configuration in MD $MA_SAFE_VELO_STOP_MODE or MD $MA_SAFE_VELO_STOP_REACTION. Remedy: If no obvious operator error occurred: check the input value of the MD, check SGEs: was the correct safe velocity selected? If the MDs and SGEs are o.k., check the machine for any damage and rectify it. Diagnostics Manual (DAsl), 03/2009 Program Continuation: Clear alarm with the RESET key. Restart part program
Source: SINUMERIK 840D sl / 840Di sl / SINAMICS S120 Diagnostics Manual (DAsl, 03/2009)
Last reviewed: 2026-07-01 · Verified against the manufacturer’s official documentation.
About Siemens SINUMERIK 840D CNC Alarms
Siemens controllers include extensive self-diagnostics that flag or halt the machine when a fault is detected. Error code 27011 on the SINUMERIK 840D CNC identifies one specific fault condition — its documented cause and the official corrective steps are listed above, sourced from Siemens's service documentation. Always confirm against the manual for your exact machine configuration and follow LOTO procedures before servicing.
Complete Alarm List: 4014 Siemens SINUMERIK 840D CNC codes.
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